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United States Patent |
5,007,079
|
Vogl
,   et al.
|
April 9, 1991
|
Coin fraud prevention unit and modular configurations for pay telephone
stations
Abstract
A pay telephone station having a lower housing coin chute (14) which is
provided with a coin fraud prevention unit (10) in the form of a thin base
(15) arranged in a slot (11) of a coin channel cover plate (12). The base
(15) is provided with a pawl (23) having a tooth (24) with a chamfered
face ( b 25) which is biased into the path of a coin passing through a
coin path (39) by a torsion spring (26). An anchor (59) for connecting a
handset (56) to the upper housing coin dial unit (50) of the station
includes a base with apertures (63, 64) and a V-shaped body (65) with a
notch 66 defined between surfaces (69, 70). A long thumbscrew member (74)
with a textured gripping surface connects the anchor (59) to a projector
(51) integral with the upper housing (50). The handset cord assembly (A)
is first passed through an aperture (54) in the projection (51) and then
through the aperture (64) in the base (60). A button (68) firmly attached
to a lanyard (67) in the armor (55) of the assembly (A) is held against
the surfaces (68, 70) by the lanyard (67) and in the notch (66) by the
thumbscrew (74) adjacent the button (68). A shorting connector (80) is
provided for rapidly changing hook switch configurations in the upper
housing coin dial unit (50). A configuration module (90) is used to
rapidly and easily connect various circuits (93, 94, 95, 96, 97, 98, 99)
on a printed circuit board (92) in the upper housing coin dial unit (50).
Inventors:
|
Vogl; Allen W. (Melbourne, FL);
Poe; Steven C. (West Melbourne, FL);
MacNeill; John H. (Indialantic, FL);
Buron; Douglas J. (Micco, FL)
|
Assignee:
|
International Teleservice Corporation (Melbourne, FL)
|
Appl. No.:
|
424560 |
Filed:
|
October 20, 1989 |
Current U.S. Class: |
379/145; 194/203; 379/424; 379/429; 379/438 |
Intern'l Class: |
H04M 001/15; H04M 017/02; H04M 001/08; G07F 003/02 |
Field of Search: |
379/145,424,429,438
194/203
|
References Cited
U.S. Patent Documents
T961003 | Aug., 1977 | Krumreich.
| |
2312970 | Jul., 1942 | McLarn.
| |
3258535 | Dec., 1964 | Nawman.
| |
3377442 | Apr., 1968 | Foster, Jr.
| |
3393273 | Jul., 1968 | Bustos.
| |
3398244 | Aug., 1968 | Ertl et al.
| |
3643205 | Feb., 1972 | Elkins.
| |
4118902 | Oct., 1978 | Saxton.
| |
4177362 | Dec., 1979 | Boenecke.
| |
4178490 | Dec., 1979 | Boenecke.
| |
4193604 | Mar., 1980 | Sarvanne.
| |
4254308 | Mar., 1981 | Blomeyer et al.
| |
4396176 | Aug., 1983 | Hannula.
| |
4518830 | May., 1985 | Drexler et al. | 179/103.
|
4542817 | Sep., 1985 | Paulson | 194/203.
|
4709897 | Dec., 1987 | Mooney.
| |
4747134 | May., 1988 | Holland et al. | 379/145.
|
4773279 | Sep., 1988 | Spease et al.
| |
4777469 | Oct., 1988 | Engelke et al.
| |
4845774 | Jul., 1989 | Arzounian | 379/443.
|
Primary Examiner: Schreyer; Stafford D.
Attorney, Agent or Firm: Evenson, Wands, Edwards, Lenahan & McKeown
Parent Case Text
This is a divisional of application Ser. No. 407,597, filed Sept. 15, 1989
U.S. Pat. No. 4918924.
Claims
We claim:
1. A device for anchoring a handset to a telephone station through a
handset cord assembly which includes a lanyard, electric wires and an
armor, comprising a projection integrally associated with the station, the
projection being provided with a first aperture for passage of the handset
cord assembly and with a second threaded aperture, a rigid anchor member
having a base with first and second apertures respectively aligned with
apertures in the projection, and a V-shaped body extending from the base
with means for securely holding the lanyard, and means for securely
joining the anchor member with the projection through the threaded second
aperture in the projection and second aperture in the anchor base.
2. A device for anchoring a handset to a telephone station according to
claim 1, wherein the lanyard is provided with a button at the free end
thereof, and the V-shaped body is notched to receive the lanyard therein
with the button abutting the V-shaped body.
3. A device for anchoring a handset to a telephone station according to
claim 1, wherein the anchor member has a bent-over portion which extends
partially over the first aperture of the anchor member to define a reduced
aperture with straight sides, and the armor is provided with a portion
which mates with the reduced aperture to provide a form-locking connection
between the anchor member and the armor.
4. A device for anchoring a handset to a telephone station according to
claim 1, wherein the joining means is an elongated body having a threaded
portion engaging a mating threaded portion in the second threaded aperture
in the projection.
5. A device for anchoring a handset to a telephone station according to
claim 4, wherein the lanyard is provided with a button at the free end
thereof, and the V-shaped body is notched to receive the lanyard therein
with the button abutting the V-shaped body.
6. A device for anchoring a handset to a telephone station according to
claim 5, wherein the elongated body is adjacent the button in such a
manner as to maintain the lanyard securely in the notch.
7. A device for anchoring a handset to a telephone station according to
claim 6, wherein the anchor member has a bent-over portion which extends
partially over the first aperture of the anchor member to define a reduced
aperture with straight sides, and the armor is provided with a portion
which mates with the reduced aperture to provide a form-locking connection
between the anchor member and the armor.
8. A device for anchoring a handset to a telephone station through a
handset cord assembly, comprising a rigid anchor member having a base with
first and second apertures and sloped members extending from the base,
wherein edges of the sloped members remote from the base form a slot
therebetween.
9. The device according to claim 8, wherein the first aperture has a
portion with a reduced width.
10. The device according to claim 9, wherein the portion of the first
aperture with the reduced width has straight sides.
11. The device according to claim 8, wherein an elongated body engages in
the second aperture for securing the anchor member to the station.
12. The device according to claim 11 wherein the elongated body is provided
with a one-way screw head.
13. The device according to claim 8, wherein the base has a narrowed
portion in which the second aperture is provided.
14. The device according to claim 8, wherein a bridging portion joins the
sloped members to form a V-shaped member.
15. The device according to claim 14, wherein the first aperture has a
portion with a reduced width.
16. The device according to claim 15, wherein the portion having the
reduced width has straight sides.
17. The device according to claim 16, wherein an elongated body engages in
the second aperture for securing the anchor member to the station.
18. The device according to claim 17, wherein the elongated body is
provided with a one-way screw head.
19. The device according to claim 17, wherein the elongated member engages
in the second aperture in the base where ends of the V-shaped member are
at their widest separation.
20. The device according to claim 17, wherein the elongated body is
provided with a one-way screw head.
Description
TECHNICAL FIELD
The present invention relates to improvements in a pay telephone station.
More particularly, the present invention relates to an improved connection
between the handset and the station housing, a simple and effective way to
prevent coin fraud, a new way to obtain prewired configurations, and the
use of modules to simplify wiring.
BACKGROUND ART
Pay telephone stations encounter a number of problems, from the point of
view of abuse and vandalism by users and of difficulties in repairing and
installing the pay telephone station. For example, a major problem which
causes significant loss of revenues to the telephone company is the
perpetration of coin fraud. The perpetrator usually attaches a thin strong
thread or string to a coin and passes the coin into the coin slot to place
a call. Typically for long distance calls or multiple local calls, several
coins are required to pay the toll. Thus, when the perpetrator inserts the
coin while holding the thread attached to the coin and dials, for example,
the desired long distance number, the telephone company advises the caller
that additional coins must be placed in the station. Instead of placing
additional coins in the station the caller, having held onto the deposited
coin by means of the thread which extends outside the station, simply
oscillates the coin within the station the required number of times to
trip the appropriate circuitry which .registers and therefore counts the
"coins". Numerous techniques have been proposed to prevent this type of
coin fraud, but they are usually fairly complex, difficult to install or
simply too expensive.
Another problem involves the handset into which the caller speaks and
through which the caller hears the voice at the other end of the line.
Even where vandalism does not occur, handsets incur substantial physical
abuse in one form or another. Unfortunately, the handset is also subject
to being pulled away from the telephone station housing whether
intentionally or unintentionally. Substantial tensile forces are placed on
the steel lanyard or inner cable connecting the handset to the station
housing, and the connection between the two must be sufficient to prevent
breakage and thereby avoid unnecessary repair. When the lanyard is broken,
tensile force transferred to the flexible metal outer armor hose may
unravel the same and expose sharp edges which can lead to physical harm to
the user and liability to the phone company. Presently available
connection systems are cumbersome to install and do not provide the
requisite tensile strength needed to handle the great variety of
situations which lead to the breakage of the connection between the
handset and the station housing.
In terms of the configuration of the wire terminations and switches within
the pay station itself, the stations currently used require time consuming
connection of spaded wire terminals to screws. Given the number and
variety of connections which must be made, the cost of labor involved in
effecting these connections becomes inordinately high.
Pay telephone hook switch assemblies typically use a camming arrangement
which is fixed to and rotated by a shaft actuated by rotation of the hook
switch lever. One such arrangement uses snap-action switches which are
opened and closed by two cams which differ from each other in curvature
and configuration to open and close the switches in a predetermined
sequence as shown in U.S. Pat. No. 4,747,134. It is currently necessary to
utilize interchangeable slides or program cards to provide different
timing configurations in a hook switch assembly which utilizes cam
switches. This arrangement requires an inventory of slides and a time
consuming operation in changing the slides when a different hook switch
configuration is desired.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a pay station which
overcomes the problems and disadvantages encountered in conventional pay
telephone stations.
More particularly, it is an object of the present invention to provide a
pay telephone station with a coin fraud prevention unit that is simple in
construction and easily installed.
It is yet a further object of the present invention to provide a very
strong connection between the handset lanyard and armor and the station
housing which is simple in construction and extremely easy to install.
It is still a further object of the present invention to provide by means
of a simple connector the ability to switch between different
configurations in a hook switch assembly.
It is yet another object of the present invention to provide a modular
arrangement of the various subassemblies and related interconnection
points within the pay station that allows the use of a simple
configuration module. This module easily installs into the pay station and
makes the needed connections without requiring these interconnection
points to be individually wired.
The foregoing objectives have been achieved by providing a coin fraud
prevention device in the form of a spring-biased pawl which permits a coin
to pass a tooth on the pawl but prevents the coin from being pulled back
through the coin chute.
One feature of the present invention resides in an anchor comprising a base
to which a V-shaped body is joined to provide for a secure holding of the
handset lanyard and armor to the telephone station housing.
Another feature of the present invention is the use of a long thumbscrew
which becomes an integral part of the anchor to secure the lanyard while,
at the same time, allowing for installation without tools.
A further feature of the present invention involves the use of a shorting
connection which changes the interconnection of wires in a switch assembly
to provide the required varied hook switch configurations which allow the
hook switch to function properly for various pay station configurations.
Yet another feature of the present invention resides in the use of a
circuit board assembly which serves as a junction for all of the various
interconnection points of the pay station. The connections are routed on
this circuit board assembly to a single common connector. A configuration
module mates to this common connector and provides the interconnections
appropriate for the pay station.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features, objects and advantages of the present invention
will become more apparent from the following description when taken in
conjunction with the accompanying drawings which show a presently
preferred embodiment of and best mode for carrying out the present
invention and wherein:
FIG. 1 is a side view showing details of the lower portion of a pay
telephone station coin chute with an installed coin fraud preventor in
accordance with the present invention;
FIG. 2 is a side view similar to FIG. 1 with a coin channel cover plate
removed to show an area in which a coin fraud is perpetrated in the
absence of the present invention;
FIG. 3 is a front elevational view of the coin fraud preventor unit of the
present invention similar to that shown installed in the coin channel
cover plate of FIG. 1;
FIG. 4 is a partial side elevational view of the coin fraud preventor of
FIG. 3 showing how a coin is allowed to descend in the coin chute;
FIG. 5 is a cross-sectional full side elevational view of the coin fraud
protector unit taken along line 5--5 of FIG. 3 showing how the unit
functions to prevent the perpetration of a coin fraud;
FIG. 6 is a partial, exploded perspective view of the pawl, base and spring
of the coin fraud protector unit of FIG. 3;
FIG. 7 is an elevational view of the coin dial unit of a pay telephone
station partially broken away and showing details of a handset cord
assembly anchor, a hook switch shorting jumper or connector, and a
configuration circuit board and module receptacle in accordance with the
present invention;
FIG. 7A is a perspective view of a broken-away portion of the hook switch
permanent or fixed camming arrangement shown in FIG. 7 and showing the
arrangement of rotatable cams with switch actuator arms biased
thereagainst;
FIG. 8 is a perspective view of the hook switch shorting connector shown in
FIG. 7;
FIG. 9 is a partial cross-sectional side view of the anchor taken along
line 9--9 in FIG. 7;
FIG. 10 is a view of the anchor taken along line 10--10 in FIG. 9;
FIG. 11 is an exploded view of the anchor shown in FIGS. 9 and 10;
FIG. 12 is a plan view of the configuration module used in conjunction with
the module receptacle shown in FIG. 7;
FIG. 13 is a side cross-sectional view of the configuration module taken
along line 13--13 of FIG. 12;
FIG. 14 is an elevational view of a conventional pay telephone coin dial
unit wiring board with spaded wire terminals and screws;
FIGS. 15A and 15B are timing diagrams showing respectively a conventional
black slide timing using interchangeable timing slides in a hook switch
assembly and the permanent camming arrangement shown in FIG. 7A with the
shorting jumper in accordance with the present invention as shown in FIGS.
7 and 8;
FIGS. 15C and 15D are timing diagrams similar to FIGS. 15A and 15B but
showing respectively conventional white slide timing and its equivalent
which is carried out in accordance with the present invention; and
FIG. 16 is a schematic diagram of the hook switch circuit which utilizes
the shorting jumper in accordance with the present invention as shown in
FIGS. 7 and 8 and timing configurations for opening and closing switches
shown in FIGS. 15B and 15D.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring now to the drawings and, in particular, to FIGS. 1 to 6, there is
shown a coin fraud prevention unit designated generally by the numeral 10
which is mounted in a slot 11 provided in a coin channel cover plate 12
with an associated coin sensor signal unit 13 of known construction in a
conventional pay telephone station coin chute assembly 14. The unit 10
shown in greater detail in FIGS. 3-6 comprises a thin base 15 made of
sheet steel, molded plastic or other suitable material which extends in a
generally longitudinal direction with a jog 16 at a central portion of the
unit. Flanges 18, 19, 38 and 38' are provided at spaced locations on the
unit 10 to allow the same to be quickly and easily located within the slot
11 when the unit 10 is installed on the coin channel cover plate 12 as
hereinafter described.
At the upper end of the unit 10, two upstanding flanges 20, 21 are provided
in which a shaft 22 carrying a pawl 23 is rotatably mounted. The lower end
of the pawl 23 is provided with a tooth 24 having a chamfered face 25. A
U-shaped torsion spring 26 is connected at a lower end 27 of the pawl 23.
The end 27 has an undercut portion. The bight portion 28 of the spring 26
passes through the thinned or undercut lower end 27, while the legs 29, 30
of the U-shaped spring extend through two holes 31, 32 provided in the
flange 17 extending orthogonally from the face of the unit 10 such that
the pawl 23 will be biased in a clockwise direction, i.e. into the face of
the unit through an aperture 33 in the body 15 of the unit 10, as viewed
in FIGS. 4 and 5.
The coin fraud prevention unit 10 can be provided with double sided tape on
the face 37 of the unit 10 adjacent the plate 12 to facilitate its
attachment to the cover plate 12 of the coin chute assembly 14.
Alternatively, other readily available, conventional fastening means can
be used to assure a positive mounting of the unit 10 in the slot 11 of the
coin channel cover plate 12 in a simple and quick manner. The installation
and operation of the coin fraud preventor unit 10 will now be described.
As shown in FIG. 2 where the coin channel cover plate 12 has been removed
and in the case where the coin fraud prevention unit 10 will not have been
installed, it can be seen how coin fraud is perpetrated. Typically, the
perpetrator will drill a small hole in a quarter 41 (shown in dot-dash
lines) and attach a fine but sufficiently strong thread 42 to the coin 41.
When placing a long-distance call requiring more than a one-coin toll or
when placing multiple local calls, the perpetrator can pass the coin
through the pay slot in the upper housing down into the chute assembly 14
while holding the string 42 outside the pay telephone station. The coin 41
is lowered until it strikes one of the coin detector fingers on the signal
unit which is mounted through slot 11. A quarter strikes finger F.sub.3 of
the signal unit 13 shown in FIG. 5, and the coin 41 then is pulled back
slightly with the thread 42 instead of allowing the coin 41 to proceed
downwardly by gravity in the coin path 39 in the direction of the arrows
in FIG. 2. This pulling back and forth of the coin 41 can continue until
the station circuitry registers that sufficient payment has been made for
the call.
In a typical installation, an upper housing (not shown) is removed from the
pay telephone station. In the lower housing (not shown), a known type of
signal connector plug (not shown) is unplugged from the chassis, and the
coin chute assembly 14 is removed from the lower housing. Mounting screws
for holding the signal pad 13, having fingers F.sub.1, F.sub.2, F.sub.3
(FIG. 5), onto the coin chute 14 assembly at locations 34, 35 are loosened
so that the signal pad 13 can be removed and set aside. The slot 11 is
already present in the coin channel cover plate 12 of the coin chute
assembly 14 and is now completely accessible. In the situation where the
coin fraud prevention unit 10 is provided with double sided tape, the unit
10 is first fitted into the slot 11 before removing the protective backing
from the tape. The locating tabs or flanges 18, 19, 38 and 38' on the unit
10 will correctly position the unit 10 in the slot 11. The person making
the installation will verify that the back 37 of the unit 10 is flush with
the cover plate 12 and also that the pawl 23 which can be made of plastic
or the like operates freely with no binding or sticking of the pawl tooth
24.
When the installer is satisfied that the unit 10 is working properly, the
protective tape backing can be peeled off and the unit 10 inserted into
the slot 11 on the coin channel cover plate 12 by locating the lowest tab
19 into the slot 11 first and then angling the unit 10 into place.
Thereafter, the installer should firmly press the unit 10 on all surfaces
and also again verify that the tooth 24 of the pawl 23 operates freely
with no binding or sticking. Then the signal pad 13 can be reinstalled on
the coin chute assembly 14, the coin chute assembly 14 installed into the
lower housing, and the signal connector (not shown) plugged back into the
chassis. Before reinstalling the upper housing, the completed installation
can be tested by dropping several quarters through the coin chute 14 and
observing the action of the pawl 23. In this connection, the tooth 24 of
the pawl 23 should kick out or rotate counterclockwise as viewed in FIGS.
4 and 5 as the coins drop through the coin path or channel 39 and into a
hopper assembly (not shown). If the installer is satisfied that the unit
10 is working properly, he or she can then reinstall the pay station upper
housing.
With the coin fraud preventor unit 10 installed as shown in FIG. 1 in the
area immediately downstream of the coin path 39, the coin 41 on the thread
42 shown in FIG. 2 is able to push the chamfered face 25 of the tooth 24
of the pawl 23 out of the way by virtue of the weight of the coin 41
acting against the light spring bias of the torsion spring 26 as shown in
FIG. 6. When the coin 41 has passed the tooth 24 of the pawl 23, as shown
in FIG. 5, the spring biases the pawl 23 clockwise so that the bottom
surface of the tooth 24 prevents the coin 41 from being withdrawn upwardly
along the coin path 39 by use of the thread 42. It will be appreciated
that as further force is expended in pulling the thread upwardly to
withdraw the coin 41, the pawl 23 will simply be biased further in the
clockwise direction as shown in FIG. 5 to preclude any possibility of
oscillating the coin 41 in a manner sufficient to trip circuitry which
registers the number of deposited coins.
As shown in FIGS. 4 and 5, the tab 18 is located in the slot 11 to the
right of fingers F.sub.1 and F.sub.2 and adjacent to finger F.sub.3, which
fingers contain piezoelectric coin sensors in a known manner. Finger
F.sub.1 detects nickels, finger F.sub.2 detects dimes and finger F.sub.3
detects quarters when the coins strike the slanted tops of the fingers or
strike the sides of the fingers. The tab 18 prevents a coin from being
oscillated to strike the side of the quarter finger F.sub.3 to trip the
coin counting circuitry, whereas the pawl 23 prevents the coin from being
oscillated to strike the tops of the finger.
Another significant problem encountered with pay telephone stations is the
installation and repair of handsets which are held to the telephone
station upper housing by a lanyard and armor. Handsets typically represent
the highest repair item in pay telephone stations because they are
intentionally and unintentionally mishandled during normal use and are
sometimes subject to vandalism. In order to provide a sufficient
connection between the handset and the telephone housing, it is desired
that the connection between the two be able to withstand tensile loads of
at least 800 pounds to prevent either the handset being yanked from the
upper housing or the flexible metal armor from unraveling and exposing
sharp edges which can harm the user. It is also important that the
connection between the handset and the housing provide for easy
installation. The arrangement shown in FIGS. 7 and 9-11 accomplishes these
goals.
In particular, FIG. 7 shows the anchor 59, lanyard 67 and armor 55
installed in the coin dial unit 50 of a pay telephone station upper
housing (not shown) in accordance with the present invention. The coin
dial unit 50 of the pay station is provided with an integral projecting
portion 51. The projection 51 is provided with a recessed area 52 (FIG.
11) in which an upper threaded hole 53 and a lower through hole 54 are
provided. The lower through hole 54 is of larger diameter than the
threaded hole 53 and permits passage of the handset cord assembly A
consisting of the armor 55 with electrical wires 57 and the lanyard 67
carried therein. In the event that the coin dial unit 50 and projection 51
are made of a plastic, a threaded metal bushing 58 is provided in the
upper hole 53 to reinforce the plastic.
The anchor 59 can be made of a sufficiently strong metal and is provided
with a base 60 having a bent-over portion 61 which is designed to seat in
the recessed portion 52 of the projection 51 on the unit 50 to provide for
easy and firm location of the anchor 59 on the projection 51. The anchor
59 is also provided with two apertures 63, 64 which align with the holes
53, 54, respectively, in the projection 51 on the unit 50. As seen in FIG.
10 the integral bent-over flange 61 on the anchor 59 reduces the area of
the elongated aperture 64 with side projecting portions 71, 72 to receive
and form lockingly hold flattened portions 73 near the end of the armor 55
upon installation as will be hereinafter explained. It is within the scope
of the present invention to provide a grounding tab between the base 60
and the bent-over portion 61 in installations in which the projection 51
is made of plastic.
The anchor 59 is also provided with a rearwardly extending V-shaped body 65
which is firmly joined to the anchor base 60. The rear end of the body 65
is provided with an elongated notch 66 which is sized to receive a lanyard
67 having a cylindrical metal button 68 firmly fixed at the end thereof.
The end face of the button 68 abuts surfaces 69, 70 of the notch 66 when
the handset 56 is pulled away from the station. A long thumbscrew 74
having a textured end portion 75 for better gripping and one-way screw
head 75' which permits an installer to only loosen the head with a screw
driver blade has a reduced threaded end 76 which is sized to pass through
hole 63 in the base 60 and be threadably engaged in bushing 58 in the hole
53 of the projection 51. The body 65 is sized sufficiently to permit the
wires 57 to be pulled through the bottom of the base and to pass the
button 68 therethrough where it can abut the surfaces 69, 70 defining the
notch 66.
The handset cord assembly A is passed through the aperture 54 in the
projection 51 on the housing 50, then through the lower aperture 64 in the
base 60 of the anchor 59. The electrical wires 57 of the assembly A are
then pulled out through the bottom of the V-shaped body 65. The lanyard 67
with button 68 is then pulled past the notch 66 in the body 65 so that the
button 68 is outside the body 65 and the lanyard 67 rides in the notch 66
as shown in FIG. 9. The flattened portions 73 on the armor 55 are then
moved under the projecting portions 71 and 72 which are spaced to receive
the flattened portions 73 snugly. The armor 55 is pushed upwardly to place
the flattened portions 73 between the portions 71 and 72 to restrain the
armor from rotational and longitudinal movement. Longitudinal movement is
precluded by the armor 55 on either end of the flattened portions 73 due
to the diameter of the circular armor 55 which is larger than the distance
between projecting portions 71, 72. The anchor 59 is then positioned in
the recess 52 of the projection 51 by means of the bent-over flange 61
which lines up the anchor holes 63, 64 with the holes 53, 54 in the
projection 51. The thumbscrew 74 is then screwed through the hole 63 in
the anchor 59 and into the bushing 58 in the projection 51 as shown in
FIG. 9.
Due to the V-shape of the body 65, any tensile force exerted on the lanyard
67 is distributed to the base to permit the anchor 59 to withstand loads
in excess of 800 lbs. without deformation. The long thumbscrew 74 becomes
an integral part of the anchor 59 while allowing for quick and toolless
installation of the cord assembly A, and acts to retain button 68.
As also previously noted, pay telephone sets are provided with a hook
switch assembly which contains multiple switches which, by means of
various methods, can be caused to operate in various sequences. Typically,
in order to change the configurations of the hook switch circuit, it has
been necessary to change a timing slide between the hook switch lever and
a cam-operated switching mechanism. Two types of slides in common use, a
black slide and a white slide, provide specific timing configurations for
the opening and closing of switches as shown in FIG. 15A depicting opening
and closing of the switches in black slide timing and in FIG. 15C
depicting opening and closing of the switches in white slide timing in
terms of both degrees of rotation of the hook switch lever and the
percentage of rotation between the on-hook and off-hook conditions. Five
switches are required and utilize the R-S (red-slate) wires, the G-S
(green-slate) wires, the O--O (orange-orange) wires, the W-Y
(white-yellow) wires and the SW-Y (slate/white-yellow) wires. In addition
to requiring an inventory of additional slide parts, the changeover is
needlessly time consuming and hazardous to the electrical contacts. The
actual details of the switches and their various purposes are well known
and do not form the subject of the present invention.
However, I have found a simple, inexpensive and effective way to avoid the
need for changing the timing slide between the hook switch lever and the
camming switch (or, in other words, to permit a permanent camming
connection) and to provide new prewired switching configurations, for
example, "C" and "D" set configurations in the switch assembly by means of
the shorting jumper or connector 80 shown in FIG. 8 used with the
permanent camming arrangement and switches shown in FIG. 7A. The hook
switch assembly shown in FIGS. 7 and 7A comprises four cams 110, 111, 112,
113 fixed to a shaft 114 which is rotated by a conventional hook switch
lever (not shown). The cams are offset on the shaft 114 in order to
provide desired timing for actuating four switches S1, S2, S3, S4 (FIG.
16) through respective arms 115, 116, 117, 118 which are resiliently
biased to maintain contact with the cam surfaces and snap the switches
open and closed as the cams move through an angle of rotation of the shaft
114 (FIGS. 15B and 15D).
The terminal connecting portion 81 of the shorting jumper 80 comprises two
female receptacles 82, 83 which permit the connector to be fitted on the
ends of male connectors 84, 85 in the hook switch circuit 87 shown in FIG.
7 effecting one type of connection or on male connectors 85, 86 in the
hook switch circuit 87 effecting another type of connection in accordance
with standard telephone hook switch configurations without the need to
change the camming arrangement itself. A schematic of the hook switch
circuit configuration according to the present invention is shown in FIG.
16 wherein only four switches are necessary, when used with the shorting
jumper 80 to effect the appropriate interconnections among the eight
color-designated wires in accordance with the timing sequence for closing
the switches shown in FIGS. 15B and 15D. By utilizing the foregoing in
connection with the fixed or permanent camming arrangement shown in FIG.
7A, it is now possible to obtain the functional equivalent of black slide
timing (FIG. 15B) and white slide timing (FIG. 15D) with four switches and
without the need for changing the camming arrangement by using changeable
timing slides or program cards. In other words, multiple circuit
configurations can now be obtained with a fixed or permanent camming
mechanism which does not require interchangeable timing slides or other
removable devices.
To further simplify changing functions in the pay station, configuration
modules 90 of the type shown in FIGS. 12 and 13 can be provided. In
conventional coin dial stations, as shown in FIG. 14, connections for
configurations known in the industry as "C/CF", "C/DTF", "C/DTF-PG", and
"D" had to be made and remade laboriously through the use of the spaded
wire terminals and screws designated generally by the numeral 91 in which
each wire connection had to be changed individually. Mistakes could easily
be made in addition to the time needed to make the connections.
To avoid this problem, the present invention uses a configuration module 90
which can be simply and easily plugged into a centralized receptacle 104
(FIG. 7) on the printed circuit board 92 to obtain the different kinds of
configurations without the need for individually relocating wires. As can
be seen in FIG. 7, various areas on the real estate of the board 92 can be
made modular. For instance, the connections from the hook switch to the
board 92 can be provided in a modular member 93 which snaps into a mating
receptacle permanently mounted on the board 92. Other modules such as a
chassis module 94, an option module 95, dial modules 96, 97, 98 and a
mercury switch module 99 can also be provided to effect known
configurations on the printed circuit board 92.
To make the appropriate and desired connections among the various
aforementioned modules on the board 92, a specific configuration module 90
with defined pin connections 100 (FIG. 13) can be provided. The module 90
is provided with flexible or resilient legs 101, 102 which are designed to
latch in apertures 104A, 104B provided above and below the centralized
receptacle 104 of the board 92 to hold the module 90 securely on the board
by means of latching protrusions 103, 103' at the ends of the legs 101,
102 when the installer's fingers release pressure on the legs after
pushing the module into place. The centralized receptacle 104 is provided
with a portion 105 which mates with a keying notch 106 on the module 90
such that the configuration module 90 cannot be inserted into the central
area receptacle 104 on the board 92 unless the module is properly
oriented. The shorting connector 80 can also be changed from one set of
wires 84, 85 to the other set of wires 85, 86 in conjunction with the
selection of a configuration module 90.
Option connector 95 is unique in the fact that other options (e.g. handset
volume amplifiers), if properly preconfigured, can be added in the field
simply by inserting the optional circuit into option connector 95 on
configuration board 92 and changing to a separate configuration module 90
that will wire the options into the pay station appropriately.
While we have shown one embodiment of each of the aspects in accordance
with the present invention, it is to be understood that the same is
susceptible of numerous changes and modifications as will be apparent to
one skilled in the art given the foregoing description. Therefore, we do
not intend to be limited to the details shown and described herein but
intend to cover all such changes and modifications as are encompassed by
the scope of the appended claims.
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